This luxury shopping lane has been protected by its own tiny police force for over a century.

A student driver's nightmare.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

Stockholm's deepest subway station is also a stunning ecological wonder.

The library's graceful rotunda is like a bibliophile's temple.

The world's largest model of our planetary system.

The world's northernmost aquarium looks like it has fallen over.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

This oceanside Reykjavik spot is speckled with recycled sculptures and large stones.

This monument to one of the largest science fiction games of all time bears the names of hundreds of thousands of players.

A bit of the Berlin Wall was gifted to the Icelandic capital to commemorate the 25th anniversary of German reunification.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This stunning concert hall has become a symbol of Iceland's national recovery.

This hobbit-y little hot spring may be the oldest spring used by humans in all of Iceland.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.